Coal mining machine



April 2, 1935. F. B. YINGLING COAL MINING MACH-INE Filed July 14, 1953 6 Sheets-Sheet mm m www@ S wm wm um R l vom .m9

April 2, 1935. F. B. YINGLING COAL MINING MACHINE Filed July 14, 1933 6 Sheets-Shea*`l mw ww @Nw wm N s Sv QN n@ n I ww M m Nm my. J m @n N ww im l, N -l N Y I w m m. NN m .mv n Ww wm. Nm. Q w N .w WW NW QW MWN Qw x// Q m S mm @oww M S n NN NS QW n o m o O O o 0 0 O GS o MQ m9 WW o PJ N S @Y WT VS ww Nv N a .m .n h Ll r April 2, 1935. F. B. YINGLING l 1,996,135

COAL MININGIMACHINE Filed July 14, 1933 6 Sheets--Sheel 3 April 2, 1935. F. B. YINGLING COAL 4MINING MCHINE Filed July 14, 1953 April 2, 1935. F. B. YINGLJNG 1,996,135

COAL MINING MACHINE Filed July 14, 1955 e sheetsheet 5 d@ n im im xm ll im m l Apil 2,` 1935. F. B. YINGLING COAL vMINING MACHINE Filed July 1491933 e sheetsheet \\\\\\\.\NE W/f l diff,

Patented Apr. z, 1935 y UNITED 7 STAT;

" Frank Yingling, Hamilton, hio, assignor 'y Cyrus J. Fitton, Hamilton, Ohio t c 2 Ai'ipiitatioiiruly 14;"19sa1seria1 No. 680,315@ in 2s claims.4 v(crete-2s).

This invention relates e to coal mining' machines, and has for'its object tofprovide,yin connection with a link carrying a cutting mechanism, means independent of the link-for tilting 55. the cutting mechanism on 'the 1ink.

Itis an vobject of this invention to provide, inv connection with *i a. link supporting,v a cutting mechanism, means tofswing the cutting mechanism laterally Von the vlink but independently oftheflink. u 'I It is also an object of this invention to provide, inconnection with avmining machine,means for supporting one end lof a ylink, Which'has on its other end a cutting mechanism, said lmeans com i prising elements adapted toconnect the yshaft from which the cutting mechanism-is operated.y

It is also an object of this invention A to provide, in connection 'with a rotatably; mountedcasing,v means for pivotally supporting one'end of` a link,A which has ontits other end cuttingmechanism,

and means supported by the casingior rotating; the cutting mechanism with relation to the link;`

said last-named means being yout of "parallelism, with the link. Y 1

n is, a., furtherY object of this invention to pro-.

vide, in connection with a'mining vmachinafa rotatably mounted casing, a shaft in the casingy supporting` one end ofA a link which hasion its 'other end .cutting mechanism, means operated by the. shaft through said link for-operating the 'f cutting mechanisma second linknadjustably con-e` nected ati-one kindio-trie casing and pivoted vat its Vother end tothe?A cutting mechanism,-jmeans f operatively Yconnected to the shaft for: adjusting i -said second link, ,and means connected to lthe shaftgand extendingA through the second link forv swinging `the cutting mechanism inV yany desired plane within the limits of the machine, for elevating the first-named link4 onthe shaftand for elevating the cutting mechanism onY the firstnamed link. Y 1 1 A particular objectcfamy inventionis topro-y Vide non-parallel linksfthe pivotal centers fof which lare connected by lines Y always outof parallelism. By eccentrically adjusting rthe vpiv-f `,1,996,135 c, COALMINING MACHINE 1' i Figure .2, is an enlafgedfvle of the vure 1.`

tothe lfact that the kerf cutter willbein properV positionthrough the parallelism of :the link's vIt. is my obj ectLto avoid, suoli .parallelism"andihring about this iipwedQadjuStment in:y kei; v Lc" tung control; ,Y w [These andlther advantages' will appear from y v y the iollowing'description takeninconnection Wth'thle drawings.. Alxa'fer'ring Yto the drawings; 'KL` v Y Figure 'lis 'averticalVY longitudinal sectionv l0 throughthe mining-machinery i 1 7; to', fa line' si the fe" ends to that of Figure 1", s` howing truck. l. ,c i, Figure" 3` is' fa ,fitopf"plan'fviewci *the* mialcifiinne;4 Figure v4 is ia' horizontal sectionshqwing hel mechanism foroperatingthe"cutter.l N J Figure 5 is af horizontal fSffltion hrqughl the' auxiliary link,1'shwig;the" mechanism for'elevateA iiigthe cutter b1ade`supportmg'1nk ofthe ma chi're, vforzglswingng: thefjcutter bla"deiflaterally;V and' for,V elevatingth A ,1 .cutter V*blade f with respect' tothe cutter blade supporting link, i f

.Figureyfvr "isis vertical.. 1 *A through 'the front :endo: th `truck)Tand then part mining ,machine adjacent "thereto,v (Withthe auxiliary link shown inside; levapimh-fll Y y mgllre .7 is a vertical 'lbrigit "dinar .sect1 n, through rthe cutter head`-l` Figure Q8 is `Isection 'onf.tliefllne figure ifij is assiomi ottenernesewing;

Fis lrie 10 is 1a ,fragmentary ieyishw'ihg the eccentricconnection between one end of the' supe plemenjtary link Vand the supporting :head: IFigure 11"' is" a fragmentary 'view partly in Vseca l tion; showing the gears for 1 rotating 'ffthe 'supple- Vrrientary link eccentric's.- f -f Figures 12 to 15, inclusive, show the mecha; nism by'which power is-transmitted from a motor to the'rotating' head,a'nd'irom thefsame motor to the wheels of rthe truck for transportingi'the truck-V. ,y j i* i 1., v .2 1 Figure-16 isa section through thetruckgshgow ing the .motor andthe shaftufrom which the truck is'drivenand the Ahead is rotated..

f 'I'hetransporting` part of the miningamachine comprises'a truck body orvframeigsupported on axles-21having wheels 3 adaptedtoztravel uponV some'suitable trackway.- fOn theirearien'dofflthe n frame isa motor 4 .adapted tosoperate a-shaft Sconnected Vatits rear end toygthe motorand supportedk at its other enelv in bear-ings Y 8 .located in a vsupporting lhead l', rotatably '.mountedfn 515;;

'SSUDf/f frame I. Y

v-lIS a stationary head 6 on the front end of the the forward end ofthe shaft is a gear. 9`,

' whileon the rearV end of the supporting head1 is a wormfgear I0, partly inclosedb'y means of a housing or casing II, andengaging a worm I2 by which it is operated. The wheels and axles are rotated by means of shafts I3 operativelyconnected to the axles by'means' 'offgears' 'I4.y On the frontend Vof thesuppOrting head1, which is in front of the stationary head, is Va casing I5, which has on opposite sides forwardlyextending arms I6. There are two of these arms,- each of which is provided with a hole `for receiving aV sleeve I1.7

These sleeves @are in a lining and veaclhasin` its inner endfbearing' members' I8, whichrlotatablysupport one end of a shaftZ. The outer ends of the sleevesY are closed by means of caps I9. These caps fit within the sleeves andvengage the bearing members and l orm with the: bearingmembers` and .the ends `,of fthe fshaft lubricant chambers. 'Adjacent cnc cnaprtneishart :nis

shaft 2|)E rotates upon' the rotation of ,the shaft'5.

Adjacent the other end cf thesnaft 2o Aisa; 'secfond` gear 22,1whicn mesheslwitn aigcarfza 1ccated onV one end offa longitudinally entending K shaft V24.supported A'byf isguitablerbearing'sj in a ng'21 therein.` Eachbusliingfltsover onefyof thegsleeves I1 sozthat'` one .end 'of the, link issupjported by means of theftwo sleeves I,'I.'Q Thearm Y end cf this link" ntsrbeweenrpgrtsQlcf tnesarm una has at che c a :pair cf gringa.;

Each arm is .providedwith' afholeV havingV abushe I6 on the casing I5.

are .two vof. thesejsegments, each joneelngaging a worin 30' locatedfon a verticallydisposedshaft f 3I, supportedk by suitable bearirigsin-.the'caslng Y. -ec

l onltheashaft V2 4 by means of someqsuitable conadjustedpositionsf This plunger. engages some I5.;V On .theupper end'ofeach shaft 3| agear 45.195, later to. be. described. .on the Shaft" zo; lietweenthe Vgea'rfZIand one of thelsleevesill, is av gear'j32.. The purpose' and .'operationof .this

gearwill bedescribed later. 'Y v Y 'Ile'slaft 24 isV supported in' A al casing- 33 4by means ofbearing members locatedinpne lend nof the casing; casing is supported in' someV suitable mannerin the interior. of the The shaft 24 forms an integral part of another shaft supportedin vbearings 3:6 thecasing Yof' clutch mechanism consisting fof an element 3'I rigidlyzattached the shaft 35',andamov ingclut'chgelement 38 slidably mounted von the -shaft 24'and'adapted to'rengageor disengage the element'3fI-.1 Y

The clutch Velement38de moved 'longitudinally nectionfbetween the 1elementand the shaft 38 supported onjthe link 25 of the casingA 33.... shaft-isiope'ratedfby. means Y'of'. `a lever V4|),1whlch has onone end a plunger 4I forfxholdingfit in suitablehole or socket in oneside off. the link l v 25. On the forward end ofthe link 25is al pair l of forwardly V`extending arms-42, each-I1of`1which- .isrv provided withf an opening inY which 4there is locateda bushing 4 3.Y vWithin V each bushing is a sleeve 44.` These sleeves are 'inalignment andv each'has init'sinner end bearing 'members 41. g The 1 sleeves 44. `serve to pivotally support `the rof a. shaft 54.

cutterY head 52, which has yextending rearwardly therefrom two pairs of Varms and 46.v These arms are provided with jholes to Yreceive the Asleeves44. Between eachv arm 45 and 45 isvone This connection betweenv the ,cutter head-and the link 25 is illustrated in Figof the arms 42.

ure 4. The bearings: serve torotatably support the ends of a' shaft 4 9. Each sleeve 44 hasV on its'outer enda`cap"48, which serves to form, in

connection withjthe bearings and the ends ofv rthe shaft 49, lubricant chambers. I` 'The shaft'49 is-rotated by means of a gear 50 n mounted onpne end thereof and engaging a gear y '5I mounted on theforward end of the shaft `35.

The cutter head 52, lwhich is infront ofthe arms 45 and.46, is somewhat circular in shape and has vtherein bearings 53', whichsupportone end Theend of the shaft to therrear of. the bearing members 53 has thereon a gear 55 which meshes with a gear 56von the endf of the shaft-49 remote from the 'gear50.

Thercutter head in advance of the-bearingA 53- is` provided with a bearing'51,whlch Vrotatably supportsthe front end of theshaftf54, `Adja jfg cent the Y.bearing 5I the shaftg54`is providedwithy agear58'which meshes with a gear 59located on a vertical shaft 60. On the upper `part voftle.v

cutter head there isprovidedan upwardly er:-g tending annular projection 6 I ,fwhileon'thelower part of the cutter head there is provided a` downl wardly extending annularv projection 82;*Withinrtheupperprojection 6I are bearings'i63g'which serve to rotatably supportzthe upper endA of the shaft 60; Withinvthe'lower annular projection 621are bearing members` 84,1which rotatablysupport the lowerendlof rtheshaft 60." i

l The numeralk 654 indicates acutter'bar which]` has 'anupperlarm 66 having a hole therein, withVV a'bushing 61V fitting about the upper annular'pro jection'S-I -and a lower varm 68 vvith a'hole there-L in for a bushing 69, which ts around the lower' IannularV projection 62. l Byfmeans of these prorjections Vand arms the Ycutter bar is rotatably sup-' ported on the cutter head. Fitting about'the Fitting withlnjthe worm gear l5', is a bracket 16, which hasrlpivoted thereto a'dog I-'I adapted to engagev the teeth-'of K the worm gear to prevent itsrotation with 'rela`' tionto `the cutter head. 'l r l n V'Ihe foregoing structure serves to operate the cutter chain Yby means of mechanism :extending from the shaft 20 tothe shaft '60. The gearf32 on the shaft 20'meshes with a gear 'I8 located' on a transversely disposed shaft 19, l supported'inj suitable bearings in the casing I5.A YThis 'gear 18 meshes'gwith a gear 80 mounted onta shaft 8I also supported in suitable bearings in the `casing I5! The gear 801s rotatably mounted onthe' shaft8I by means of a sleeve 82,y which has lonnits inner'end aclutch element`83. The 'gear '8U and the sleeve 82 rotate together;

Also `meshing with the gear 'I8 Yis afsecond Y' gear 84 mounted on a shaft`-85 supported in sultable bearingsin the casing I5` On this shaft85 is a second gear 86, whchmeshes with a r-'gear 81 mounted upon as'leev'el 9| 4looselymourlted on theshaft 8 This sleeve has on its inner end a clutch element/89."V i 5 Between the clutch elements 83 and B9 .and mounted on the shaft 8| is a sleeve '99, which has on one end aclutchelement 9| adapted to engage-the clutch element 383,'and on its'other end a clutch element92 adapted .to engage' the clutch element 89. The clutch'elements` are `inclosed Within a casing 93a which supports. suitable clutch shifting means 93. Adjacent each end of the shaft 8| is aworm 94 engaging the worm gear 95, located on the'upper endof thelshaft 3|, The shaft 8| is rotated in one direction through the lfollowing chain of gears: geary 32 located on the vshaft 20; gear 1|l;` gear-89 located'on ther sleeve y82.` This sleeve is caused' to rotate with the shaftv through the clutch element. 9| engaging thefclut'ch. element'133..` 1 .i 4

In order to rotate the shaft 8| in reverse di-V rection it is operated through the following chain of gears, starting .with theV gear l32 mounted on y the shaft 20. This geardrivesfthegear 19; gear.

84 on the shaft85; 'gear B6 on theshaft 85 meshing with the gear 91. on'the. sleeve 88 .and Ythe clutchelementy 92 engaging theclutch velement 89. By means of these chainsof .operation the link 35 is .causedY to swing Aontiie sleeves l1.

mounted in abearing 1|0| 4formed lin one of.' the arms |'|A extending forwardly from .the casing l5. On the other end of the shaft andsplined thereto ls a bushing` |92 rotatably supported in a bearing |03 formedfin .the otherone of the. forwar extending arms I6 ofthe casing |5.

On the outer endof each of' the bushings|00 and |02 is an Yeccentric y:HNL These eceentrics serve as adjustable supports for the rear .endl of a link ||l5, `whichr hasextending rearwardly therefrom' arms |06, each of'which -is provided with a circular.openingfto'receiveV one of these y eccentrics.. Suitably supportediby some part of one of the arms |6 is a casing |01, which incloses the worm 99 and the worm gear-H1 slidably mountedl on one end of a'shaft |09-, j

.This casing `|111 is provided witha circular ex` tension |08 for housing one 'endof the shaft |09, supported in bearings in the casing and in some suitable part of. the framefstructureof the vlink |05. The shaft: |09 is surrounded by'afbushing ||0 locatedfadjacent the worm gear I||. l.Eic-

' tending from the casing in a forwardlydirection on the link |05.

andr surrounding the shaft. |09 and they bushing H0 is a sleeve ||2 which has slldably mounted thereinra sleeve ||3 supported atone end'on the link |95. lThese twoy sleeves .sulzistantallyvv inclose .the shaft |09.

' Within the sleeve I3 and around the shaft |99 is a bushing I4. The bushing ||4.and the sleeveV H3, together with.r the"busliing |.|0, `provide a space around the shaft |99. in which a shoulder v| l5 on the shaft |09rnay oscillate with the shaft. The mechanismhjust described provides fora longitudinalflmovement of. the casing v|01 on the shaft |09, due to theactionof the eccentrics On'the forward end ||6 which meshes with gears ||-1 and H8 loosely of .the shaft |09 is agearv mounted on a shaft |49. VIntegral gear 4|? "is a u'gear 129.1' `Between the. gears `I l1 .and l!! #and the shaft .l I! is a bushing Ingwhle'spporting thesey two gears. inf suitable. bearings in part ofthe link structure isa" bushing luf' 'Ihe gear |29 meshes'with agear |28: lomted` on one end'of aV shaft |24 supported in vbearings '125.

ymeiznbers |26 adapted-tote engaged-by a clutch 1:1 sudamy mounted onine-'shaft m tnerebe:

tween. These gears are rotatably mounted on the shaft' |24landare selectively causedwto .rotate therewith by means of. this clutch |21. Tl'iese'tw'o gearsri and the clutch. lzlare'inclosed in 'a casing |28.. The two gears |29 mesh with a geur |29 on one end of a shaft |3l,'which hask adjacent its other end a worm |31 yin 'mesh with-'a worm gear' |32 locatedon-one 'endof the shaft.; ..Betweenzthe :gears-'H1 and 5| Iland on .the

shaft '|19 is a'clutch |33 slidably inountedzoxi-thev shaft for causing thetgears. to rotate selectively withfthe'fshaft. On" one end of the shaft V| |915 a sleeve |34 supported 'in a:bushing ,|85 mounted 'in some suitable' part otthe linkv |05." On the extreme end'ofthis shaft; `beyond the sleeveil,

is a latchidisc |36 adapted tobe adjustably con;

nected to ."thesleeve bymeans of. lock members |31 mounted :onthe sleeve andadapted toengage the teeth ofthedisc.

The sleeve unas thereomgear 'securisel adapted. to .engage al gear |38a attached to.r a

sleeve |39 rotatablymountedon ashaft '-|49., `1 On f,

a suitable bearing vin the-link; |05.4 Between vthe shaft||9-andthe sleeve|44f is.abushing |46. This endof theshaft; H9 is also `provided with-av u toothed disc Iyengaged by adjusting means |48looated onthe sleeve|44tf whichengage a gearl |50 mounted upon a sleeve |51 supported inv bearings|52v inthe-link |05. This .sleeve is rotatably mounted upon a shaft |53,"whichfis'in'line-with `theshaft |40 andv is supported by` means ofV bearings |54 in the `lint'.

- |85. Surrounding the adjacentends of the shaft` |40 and the shaftr|53isa clutch mechanism |575. This clutch mechanism is composed of twovparts adapted to rotate independently, but r which are moved together longitudinally on the shaft;y VOne part of this clutchlmechanism, `v v'ill'engage a cor-l responding clutch mechanism on ther Sleeve 39, while the other .partyof this clutch mechanism willgengage a clutch member fonfone end of the" sleeve |5|.; These two shafts maybe causedfto rotate selectively but are.- never rotativelyvr driven at the same time.v

1 On the outer end ofi the shaftf|53aisga .gear |56 which meshes .withfagpinion 51 located on oneend of a shaft |58. r,Onthefouter endof the shaft|40 isa fpinionz |59 .which .mesheswith a gear |60 on'the end ofthe shaft1|58 opposite the pinion-'|5141-The'pinion |51g-also engages and I' operatesa gearggliil;,locatedfon onefgend: of a shaft |62. On each -end'oftheshaft |62y isi-a sleeve |63' mounted :inv bearings provided i therefoi-.in arms |64', providedon the forwaxtdrend ofthe link m5; Betweenthetwosieeve is; isa,"

worinlli splined to the shaft"|62. Betweenfthls worm V.and Aeach sleeve, isfathrust bearing., 66.

r x llrrtendingA rearwardly .from-the cutter. head is a: plurality of @arms |61,- which are providedwith armsinterconnect withthe forwardly extendingarms of Ytheilink |05, so theycannotV move' longitudinally. of the' shaft'withrespecty to the link V-'|05,' Ybut 'may freely Vrotate on` theshaft. .The wormV |65 vengagesth'e :worm igear 515,101; p

swinging the cutter head aboutftheishaft60."

.The power -is Vtransmitted from the motori,

communicate'power to twolines of power trans- ,missicm, one-.through theV main. link4 25 ,for i op.-

Y eratingethe,cuttenlocatedon the cutter `bar,and Y the otherithrough arr auxiliary` or supplementary link 1051i yfor adjustingl the auxiliary; link '|05' i and -forgshiftingathecutterbarelaterally on Aits pivotv on the cuttervghead.-

t l Vl'orftht'e `purpose.oi.lcontrolling the applica: tion fof power f to the various ,parts-,rtheisuppleL From tnishaftzu power is transmitted through shafts -24 and-35 to.-shaft.;49,.from which motion isltran'smittedfto the shaft. 542101' operating the sprocket" Wheel to whichffthe .cutter..is.app1ied.

From the shaft 20 power is transmittedzthrough the gear`32 andthe shaft-8|. for? rotating theV lshafts-11|,'bywhichthe links are tiltedsothat Y the ,'cuttenhead may be elevated'.or:1adiusted'.1:;I.

i end offtheamainfiinnfthrough Athe :temerario` 35,

mechanismiii-lfocated Aon the" forward fend ofthe lauxiliary or upper. link |05, operatively; connectV ed 1 ii/'ith the shaft' 20; Y'I'hroughfa seriesY of gear# Vmg btweerrshaftfznfand-the sharm sz'uie worm Y 4|65isY operated for*'swinginglthey cutter fbar "lat- 20 and'49fr1n other wordsgtheilinkslarefout 'of parallelism fand are of unedualj'lengthbetween pivots, the upper? link-|05 lbeing l'ongerthan vthe loyveflink 25', lasvvill be seen-from Figure-v '11/ Be'- ing vout of parallelism i the necessity is= demon#- Qstratedyto the operator constantly forV adjusting the eccentric support offthe shaft? 98 "insorder to bring *the l kerf f cutter '.into I the desired planet.v "This-results inA constant-attention KAto thisv factorAL `of operation; With'f'V a.V 1 i correspondingly "greatly increased accuracy in theloeationof; the

kerf inthe desired'.plxagri'efwithv a" resulting =in. creaseirijthefamount offcoal'mined; f

v"The 'supporting or rotating head 1 isrotated b'y means -f1a `inotor 68 suitably `supportedaon the truck."v "'-I'hissame motor is used fori proplling'thetruck'alnga track. *On one' endzof Vthe'motorshaft' is apinion |69, Whichj meshes with an idler pinion |10, engaging' 'a gear! .|1l

mounted upon a shaft "|12 rotatably supported in" suitable bearings*onthetruckfframe.` j Y O nlon end of the shaft |12Y isagear y|13 meshe' ling' Withftiivootherg'ears' IHiand |18, rotatably Vmounted-'on a shaft'fl16: vIntegral with the gear Y ildis aiclutc'h'member |15 adaptedtobe engaged by YaV lutchfmember 1| 11 'slidably" mounted. upon theshafpt |16* but 'rotatable' therewith. "On the gearf|18 is'a clutch member|19fadapted Ytorbey engaged by la clutch member-|80islidably mount# @from thershaft'l 1s, but rotatabie therewith.. The

clutchelements` |11 and |80 areoperatedsimultaneo'usly to be 'engaged with or disengaged from the clutch elements lflland'VY |19.;4 VBy means, of V these .various clutch 4elements the direction of;` .rotationofr the lshafti|16V may be controlled.

The gears |13, |14 and |18 are inclosed Within a housing |8|g-.

' Onone endrof the meshing `with 1a geara|83 on one endof ashaft |84, vwhichhasfon its-:other end apinion |851in 167 isf .bimnfiar engagement'with'a gear |86 mounted on oneV endV of a shaft |81, which carries-the wormgl2, which engagesv the worm gear `|01'Vor rotating the head 1.

`Afllxedfto the shaft |12 and ,adjacentjoneend thereof -ls va gear 88 whichmeshes with a gear |89 mounted Von a shaft |90.,l g AttachedLto the gear |89 isa clutch-element |Y9|'j`whichisadaptedto be, engagedfbyaa clutch @element .|92 slidabjly mountedv on. the ,shaft |90 forrotationtheref 1 with.` Onthe` end oi! the shaft 112,1 remote from mounted also. on the shaft" |90.,

idler pinion |94 in engagemntfwitha pinion |95 n Attached to ther-.pinion uns a-.clutci eiment |96 vadapted to be engaged bya clutch'element I 91suitablyattached tothe clutchelement |92 for simultaneousuoperationtherewith, by means of a4 clutch operatingmeans |398. By"the' operation of the clutch elements .I 92 land |91 thejdif rectioriA ol" rotation ofthe'shaft |90 may: bedeterf mined;- On oneend ofzthe shaft. |90 is aworm |99in engagement-with a WormV gear 200, ,mounted on a shaft 20|. A'On one end ofgtheshaftr20| isa gear 202-iin operativeengagement with a'gear 203 aixedrto one en'df offa shaft 204.*f'1l'iis'shaft 204 hasthereonfa Worm: 205 which engagesra worm gear; 205 VVmounted on ,a longitudinally ex.v

tendingv shaft", 201.

.The gear 206'hasthereon a'clutch element208 adapted to'be engagedby a clutch member 2|| `slidably mountedonthe shaft 201:.` Thissc'lutchVV 2|| isadaptedto engage a 'clutch element-2mV mountedv upon a gear 209, rotatablymountedony The gear 209;'engag'esfa pinion 2 2;

the shaft 201. Y whichisfintegr'al withthegear |88;A 31;

. Thereis also mountedon 'thes'haft 201 a gear 2| 3 which meshes with aigear 2|4jon the shaft I3.v VThe shaft fl 3 is the'` shaft which drivesv ,the axles Vforrotating the wheels thatcarry the truck.

through theV gear 209, depending uponwhat clutch element is engaged byethe` clutch 2H.A VVIi the Thetruck is driven throughythe shaft201. This Nshaftmay= berotatedv through the gear 206er clutch element 208 is engaged by the c1utch52|| Y' the truck iis `caused to travel throughthe ,operi-V` ationfof thershaft `204, the gear "mechanismbetweenthis shaft, andthe shafty |12.

' In ythe event that the `clutchv2| |Y is'Y in engage'- mentggwith the clutch elementV 2|0 the truck is propelled bytheoperation of the shaft 201 directly through. theA shaftV |12.

ment of the truck may be. controlledby operation l 'Ifhedirectionof ff rotation of the-head 1 is controlled by the move# ments =of theclutch elementsf|15 vand |19. 'The of the clutches |92 and |91.

speed with which the truck tra'vels Vis regulated by i, meansof the clutch 2| Il.' The sideif-rame is cut away ladjacent the gears 202 Vand 203 to provide apassageway through which thesegears'may be `changed so that `ge'arsfoi "differentsizes may befused` .forvaryingf the speed.` Avclosure 2|'5`is provided for covering the'gears 202 and 203. :It `willfbe understoodthat` I desire tocvomprlehendzwithinimy invention such modicationsaas come within the scope of my claimsand my invention. K. Y 'Having thus fully described my invention,l.what

The direction of move-V Y 

